From 3f17991488af62265c8335b42585c36cdee5ad05 Mon Sep 17 00:00:00 2001 From: Akhil P Oommen Date: Tue, 2 Sep 2025 17:20:02 +0530 Subject: [PATCH] drm/msm/adreno: Add a modparam to skip GPU During bringup of a new GPU support, it is convenient to have knob to quickly disable GPU, but keep the display support. This helps to fallback to 'kms_swrast' in case of bootup issues due to GPU. Add a modparam to support this. Signed-off-by: Akhil P Oommen Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/672262/ Link: https://lore.kernel.org/r/20250902-assorted-sept-1-v1-3-f3ec9baed513@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/adreno/adreno_device.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c index 50945bfe9b499..28f744f3caf7c 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_device.c +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c @@ -24,6 +24,10 @@ bool disable_acd; MODULE_PARM_DESC(disable_acd, "Forcefully disable GPU ACD"); module_param_unsafe(disable_acd, bool, 0400); +static bool skip_gpu; +MODULE_PARM_DESC(no_gpu, "Disable GPU driver register (0=enable GPU driver register (default), 1=skip GPU driver register"); +module_param(skip_gpu, bool, 0400); + extern const struct adreno_gpulist a2xx_gpulist; extern const struct adreno_gpulist a3xx_gpulist; extern const struct adreno_gpulist a4xx_gpulist; @@ -184,6 +188,9 @@ bool adreno_has_gpu(struct device_node *node) uint32_t chip_id; int ret; + if (skip_gpu) + return false; + ret = find_chipid(node, &chip_id); if (ret) return false; @@ -404,10 +411,16 @@ static struct platform_driver adreno_driver = { void __init adreno_register(void) { + if (skip_gpu) + return; + platform_driver_register(&adreno_driver); } void __exit adreno_unregister(void) { + if (skip_gpu) + return; + platform_driver_unregister(&adreno_driver); } -- 2.47.3